/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 *    SystemInfo.java
 *    Copyright (C) 2005 University of Waikato, Hamilton, New Zealand
 *
 */
package weka.core;

import weka.gui.LookAndFeel;

import java.util.Collections;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;
import java.util.Vector;

/**
 * This class prints some information about the system setup, like Java version,
 * JVM settings etc. Useful for Bug-Reports.
 * 
 * @author FracPete (fracpete at waikato dot ac dot nz)
 * @version $Revision: 1.5 $
 */
public class SystemInfo implements RevisionHandler {

	/** for storing the information */
	private Hashtable m_Info = null;

	/**
	 * initializes the object and reads the system information
	 */
	public SystemInfo() {
		m_Info = new Hashtable();
		readProperties();
	}

	/**
	 * reads all the properties and stores them in the hashtable
	 */
	private void readProperties() {
		Properties props;
		Enumeration enm;
		Object name;
		String[] laf;
		String tmpStr;
		int i;
		Memory mem;

		m_Info.clear();

		// System information
		props = System.getProperties();
		enm = props.propertyNames();
		while (enm.hasMoreElements()) {
			name = enm.nextElement();
			m_Info.put(name, props.get(name));
		}

		// additional WEKA info
		m_Info.put("weka.version", Version.VERSION);

		// look and feel info
		laf = LookAndFeel.getInstalledLookAndFeels();
		tmpStr = "";
		for (i = 0; i < laf.length; i++) {
			if (i > 0)
				tmpStr += ",";
			tmpStr += laf[i];
		}
		m_Info.put("ui.installedLookAndFeels", tmpStr);
		m_Info.put("ui.currentLookAndFeel", LookAndFeel.getSystemLookAndFeel());

		// memory info
		mem = new Memory();
		m_Info.put(
				"memory.initial",
				""
						+ Utils.doubleToString(
								Memory.toMegaByte(mem.getInitial()), 1) + "MB"
						+ " (" + mem.getInitial() + ")");
		m_Info.put("memory.max",
				"" + Utils.doubleToString(Memory.toMegaByte(mem.getMax()), 1)
						+ "MB" + " (" + mem.getMax() + ")");
	}

	/**
	 * returns a copy of the system info. the key is the name of the property
	 * and the associated object is the value of the property (a string).
	 */
	public Hashtable getSystemInfo() {
		return (Hashtable) m_Info.clone();
	}

	/**
	 * returns a string representation of all the system properties
	 */
	public String toString() {
		Enumeration enm;
		String result;
		String key;
		Vector keys;
		int i;
		String value;

		result = "";
		keys = new Vector();

		// get names and sort them
		enm = m_Info.keys();
		while (enm.hasMoreElements())
			keys.add(enm.nextElement());
		Collections.sort(keys);

		// generate result
		for (i = 0; i < keys.size(); i++) {
			key = keys.get(i).toString();
			value = m_Info.get(key).toString();
			if (key.equals("line.separator"))
				value = Utils.backQuoteChars(value);
			result += key + ": " + value + "\n";
		}

		return result;
	}

	/**
	 * Returns the revision string.
	 * 
	 * @return the revision
	 */
	public String getRevision() {
		return RevisionUtils.extract("$Revision: 1.5 $");
	}

	/**
	 * for printing the system info to stdout.
	 */
	public static void main(String[] args) {
		System.out.println(new SystemInfo());
	}
}
